Portable circular handsaw.



L. H. MARTIN.

PORTABLE CIRCULAR HANDSAW.

APPLICATION FILED NOV. 14, 1913,

L. H. MARTIN. PORTABLE CIRCULAR HANDSAW.

APPLICATION FILED NOV. 14, 1913.

1,1 33,443, Patented Mar. 30, 1915.

2 SHEETS-SHEET 2.

III

WITNESSES I/VVE/l/TOR Specification of Letters Patent.

FFTQE.

PORTABLE cracn'naa nannsaw.

Patented Mar. 34), 1915.,

Application filed November 14, 1913. Serial No. 800,987.

To all whom it may concern:

Be it known that I, Loom Ha MARTIN, a citizen of France, and a residentof Augusta, in the county of Kennebec and State of Maine, have inventeda new and Improved Portable Circular Handsaw, of which the following isa full, clear, and exact description.

My invention has, for its object to provide a portable circular hand sawwith mechanical means for operating the saw.

Another object of the invention is to so construct the parts that thesaw which is of the circular type, may be conveniently replaced as maybe desired, either by a new saw or with a saw of a different size, orwith teeth of any type to meet the conditions of use.

. Additional objects of the invention will appear in the followingspecification, in which the preferred form of my invention will be founddescribed.

In the drawings similar reference characters refer to similar parts inall the views, in which Figure 1 is a view showing one side of theinvention; Fig. 2 is a plan view of Fig. 1; Fig. 3 is an enlarged viewshowing a portion of the other side of the invention; Fig. 4 is asectional view on the line 4-4 of Fig. 3; Fig. 5 is an enlargedsectional view on the-line 55 of Fig. 2; Fig. 6 is an enlargedfragmentary view, showing in section the means for holding in positionthe stud to which the circular saw is secured; Fig. 7 is a fragmentaryview, showing the means for holding in positionthe bevel gear mounted onthe shaft; Fig. 8 is a sectional view on the line 8'8 of Fig. 2; andFig. 9 is a sectional fragmentary view, showing the guard for theswitch.

" By referring to the drawings it will be seen that a motor casing 10 isprovided, this motor casing being constructed in sections 11 and 12,which are secured together by means of screws 13, which pass through theopenings in the lugs 14, projecting from the sections 12 and which meshin threaded openings in the lug 15,.projecting from the section 11. Ahead 16 is secured to one of the sections of the motor casing, this head16 having a slot 16 through which the shaft 17 may pass when the motorto which the shaft is secured is removed from the motor 18, having arms19 and 20, a bearing member 21 being secured to the arms 19 and 20.

at one side of the open frame, this hearing member 21 being provided forengagement by one side of the shaft 17, a companion bearing member 22engaging the other side of the shaft 17 forming a bearing for saidshaft. The bearing member 22 is secured to the bearing member 21 byscrews 23. The shaft 17 has collars 24 and 25 which engage the end ofthe bearing to prevent any longitudinal movement of the shaft 17. Beyondthe collar 25 at 26, the shaft is angular in cross section and on thisportion of theshaft, there is mounted a bevel gear 27 for movinglongitudinally on the shaft and for rotating therewith. The outwardmovement of this gear 27 is limited by the washer 28. At the end of theshaft 17 as a means forholding the gear 27 outward against the washer,an arm 29 is provided which is pivoted to the shaft 17 at 30 and whichwhen moved to the position shown in Fig. 7 of the drawings, serves tohold the gear 27 in engagement with the gear 31 secured to the circularsaw 32. This circular saw 32 is mounted on a stud 33 which is normallydisposed in the slots 35 and is seated against the bearing surfaces 34in the arms20 of the open frame. At the sides of the slots 35 there aregrooves 36 for receiving the ribs 37 on the bearing members 38, thesebearing members 38 being held against the under side of the stud 33 bymeans of the arms 39 pivoted to the open frame 18 at 40, the arms 39having recesses 41 for receiving the screws 42, so that the screws 42may be turned home against the arms 39 at the sides of the recesses 41for holding the arms 39 in position to retain the bearing members 38 inthe slots 35. The screws 42 mesh in threaded openings at the bottom ofthe open frame 18.

From the construction which has been described, it will be seen that oneof the circular saws may be readily removed to permit the use of anothercircular saw of greater diameter or with teeth of any type, for the arm29 may be moved to a position at right angles to the shaft 17, to permitthe rearward movement of the gear 27, after which the arms 39 may bemoved at right angles to the open frame, to permit the downward movementof the bearing members 38. When this has been done, the circular saw 32together with the stud may be moved downward into the slots 35 to freethe circular saw 32 from the shaft 17 and the open frame 18. Another.circular saw may be secured in position by moving .its stud 33 in theslot 35, after which the hear ing members 38 may be secured in positionand the gear 27 may be moved into engagement with the gear 31 which issecured 'to the new saw 32 and held in this position by the arm 29.

As a means of protecting the top of'the circular saw 32, a guard 43 isprovided, this guard 43 having two centrally located standards 44, eachprovided with a depending pin 45 for engagement in orifices in the openframe 18, these standards 44 being disposed one at each side of thecircular saw 32, as will-be readily understood. The inner ends of theguard 43 have flanges 45 which' are provided with slots 46 for receivingthe shanks of the screws 47 It will be seen that when the guard 43 hasbeen raised sufiiciently highto remove thepins 45 from the orifices,that theguard may be moved forward relatively to the open frame -,18 tofree the flanges45 from the screws 47. The front of the guard 43 has adepending flange 48, which is provided with an orifice, through whichthe shank of the screw 50 is disposed, this shank of the screw 50meshing in a threaded orifice in a head 52 secured to the guide members53, which are provided for movement in the guideways 54 at the extremeend of the open frame 18. The guide members 53 have threaded orifices 1nwhich are disposed the screws 56, so that'when the screws 56 are turnedby their heads 57, the screws will engage the open frame 18, at theinner sides of the guideways 54 for holding the guide members53'relatively to the open frame. This means for securing the forward endof the, guard 43 is provided so that it may be adjusted to accommodateguards for circular saws greater or lesser in diameter. As a means oflimiting the depth of the kerf made by the saw, a gage 58 is provided,this gage 58 having a roller 59 journaled atits lower end and beingprovided with a slot 60, in which the guide screws 61 are disposed,these guide screws being mounted at the side of the open frame 18. 'Whenthe gage 58 has been adjusted. as may be desired, with reference to theperiphery of the circular saw 32, the gage '58 is secured in adjustedposition by the screw 62, whichis disposed through the slot 60 and whichmeshes in a threaded orifice in the open frame. When the screw 62 isturned home, itengages the gage 58 at the sides of the slot 60, andpresses the guide member against the openframe to secure the guidemember relatively thereto. The upper end of the gage 58 is provided witha flange 63 which serves as a convenient means for adjusting the guidemember relatively to the which when pressed downward connects thecurrent passing through the cable 66 with the motor inclesed within themotor casing 10. -It willtherefore be seen that the current may beturned on by the operator with the pressure of his thumb against theswitch 65. As a means of protecting the switch 65, so that it may not beoperated at an inopportune time, a guard 67 is provided, which isdisposed over the switch 65 when the saw is not in use, the guard 67telescoping with the guard member 68 when it is pushed forward to coverthe switch 65. The guard 67 is normally held over the switch 65 by meansof the spring 69, which is shown in Fig. 9 of the drawings;

As a means ofstopping the saw '32 when the current has been turned off,I provide a friction member 7 0, which is mounted on a stud 72, disposedthrough an orifice 71 in the open frame 18, this stud being held normally in the position shown in Fig. 2, by means of the spring 73 whichis curved around the stud 72 and-is disposed between the open frame 18and the head 74, with which the stud 72 is provided. When it is desiredto stop the saw 32 after the current has been turned ofl",the stud 72 ispressed inwardly against the tension of the spring 73 to bring thefriction member into engagement with the saw 32.

Having thus described my invention, I claim asnew and desire to secureby Letters Patent In a portable circular hand saw, a frame, a studjournaled in the frame, a saw mounted on the stud for rotatingtherewith, a saw guard disposed .ov'er' the saw, means for detachablvsecuring one end of the saw guard to the frame, there being a guidewayin the frame, a guide member for moving in the guideway, a flange on theother end of the saw guard, and means for detachably se curing theflangeto the ide member.

In witness whereof have signed my name to this specification in thepresence of twosubscribing witnesses.

LOUIE HYPOLITE 'MARTIN.

Witnesses:

CORA A. Jones, FLORA E. PIERCE.

